Anthropic's Claude Fable 5 Returns Online as US Lifts Export Rules

The U.S. Commerce Department has lifted export controls on Anthropic’s Claude Fable 5, allowing the model to go back online worldwide on July 1 across Claude.ai, the Claude Platform, Claude Code, and Claude Cowork. The controls had blocked access for foreign nationals after a jailbreak prompt could bypass safety rules; Anthropic says it patched the issue with a new safety classifier that blocks the technique in over 99% of attempts and reroutes problematic requests to the weaker Opus 4.8. Mythos 5 remains under tighter restrictions. Access began for about 100 U.S. companies and federal agencies on June 26, with plans to widen further; the company is introducing a standardized jailbreak severity scoring system and a HackerOne program for researchers, reflecting ongoing governance and risk-management efforts around frontier AI models.